野外现场调查是勘测泥石流的重要方法，可直接获得大量第一手资料。泥石流野外调查分为区域调查和沟谷调查2种。区域调查主要对泥石流形成和活动区域的背景资料进行收集和分析，识别出泥石流沟；沟谷调查是对某一具体的泥石流沟的地貌、地质、气候、水文等泥石流形成条件和泥石流特征进行了调查分析，确定泥石流防治工程设计所需的各种参数。本文对2种调查的技术方法进行了总结与系统阐述。

Method of field survey for debris flow is classified into two types：regional survey and gully investigation． Two methods are systematically discussed． Regional survey is main to collect and analyze the background material of the formation and active area of debris flow，then to distinguish the debris flow gullies．The gully investigation is main on the landforms，geologic structure，weather and hydrology，etc．of some specific debris flow gully，there form to determine the different indices needed by the control engineering design of debris flow．